An analog touch control device based on electric field induction

Abstract

The present invention discloses an analog touch control device based on electric field induction, which includes a signal processing component, a signal generation component and a signal control component that are all connected to the signal processing component; the signal generation component is used to generate an excitation signal; the signal processing component is used to process the excitation signal and generate a control signal; the signal control component is used to transmit the control signal to the effective touch area of the capacitive touch screen and generate an analog touch signal to simulate the touch operation on the target touch point of the capacitive touch screen. The analog touch control device based on electric field induction in the present invention borrows the common ground of the analog touch control device and the capacitive touch screen of the intelligent terminal, thereby establishing a voltage reference point, transmitting the excitation signal to the surface of the effective touch area of the capacitive touch screen, generating an electric field, so as to affect the charging time of the receiving end of the capacitive touch screen and achieve the analog touch effect.

Description

Technical Field

[0001] The present invention relates to the field of touch control technology, and in particular, to an analog touch control device based on electric field induction. Background Art

[0002] At present, intelligent terminals (such as smart phones and tablet computers) have been very popular. More and more large-scale online games can be perfectly adapted to current intelligent terminals, and more and more game enthusiasts are more keen on intelligent terminal game products. When playing games, intelligent terminals cannot use a mouse or keyboard like a PC to control the game. In many occasions that require multi-button operations, it is extremely inconvenient. As a result, more and more mobile game devices adapted to intelligent terminals have emerged. Most intelligent devices generally use input devices, such as buttons, joysticks, capacitive touch screens, electromagnetic styli, infrared touch screens, etc. Through the corresponding input devices, the function operations that users want to achieve can be realized, which is relatively intuitive.

[0003] However, there are certain limitations in directly operating with the corresponding input devices. Buttons have a single function and cannot achieve trajectory movement. Joysticks can achieve trajectory movement, but there are defects in realizing a single button function. Currently, the most common capacitive touch can not only achieve click button operations but also achieve movement trajectory operations. It is the most common terminal input device for intelligent terminals. However, when operating the touch screen with hands, the touch sensitivity will be affected due to the sweat stains on the hands, which affects the user experience. With the increasing entertainment and playability of intelligent terminals, the experience is getting stronger. With the continuous enrichment of the game types of intelligent terminals, people's requirements for touch operations on intelligent terminals are getting higher and higher. Due to long-term operation of the touch screen, such as moving and clicking, it will cause sweating and peeling of the fingers, and at the same time, it will also affect the sensitivity of the capacitive touch screen. Therefore, there are currently game pads for intelligent terminals. The intelligent terminal and the game pad transmit signals through wireless connection (such as Bluetooth, 2.4G, 433MHz and other radio frequency connections) or wired connection (such as USB, serial port and other wired connections). Wireless connection often has delays, and wired connection requires cables. Moreover, the corresponding game pads need to be equipped with corresponding communication modules to communicate, which increases the design limitations. Wireless delay and peripheral wiring seriously affect the user game experience and the operation is extremely inconvenient.

[0004] Patent for Invention 201711024701.9: Touch Control Device and Touch Control Method Applied to Capacitive Touch Screen. By using the excitation signal data of each pixel point on each first coordinate axis stored in advance, when an analog touch operation needs to be performed, the excitation signal data of the target touch point at the position to be touched is obtained and generated from the excitation signal data, and an analog touch signal is generated and output to the signal receiving electrode corresponding to the target touch point to complete the analog touch operation. Only a signal output component is required without a signal acquisition component to collect the excitation signal on the signal sending electrode, reducing costs. However, the patent uses capacitive air mapping, which is only applicable to mutual capacitance patterns, has no reference points, is greatly affected by the induction distance, and is unreliable. Therefore, there is an urgent need for a touch screen control device that can achieve the corresponding touch function without directly operating the touch screen. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an analog touch control device based on electric field induction in view of the above-mentioned defects of the prior art.

[0006] The technical solution adopted by the present invention to solve its technical problems is to provide an analog touch control device based on electric field induction, which is applied to a capacitive touch screen. Both the analog touch control device and the capacitive touch screen are connected to a common ground. The analog touch control device includes a signal processing component, a signal generation component and a signal control component both connected to the signal processing component; the signal generation component is used to generate an excitation signal; the signal processing component is used to process the excitation signal and generate a control signal; the signal control component is used to generate an analog touch signal according to the control signal and transmit it to the effective touch area of the capacitive touch screen.

[0007] After receiving an analog touch instruction, the signal processing component enables and processes the excitation signal generated by the signal generation component and generates a control signal. The signal control component transmits the analog touch signal to the effective touch area of the capacitive touch screen to simulate a touch operation on the target touch point of the capacitive touch screen.

[0008] Preferably, when the signal generation component is a signal generation circuit, the frequency and phase of the excitation signal are close to the oscillation frequency and phase of the capacitive touch screen itself.

[0009] Preferably, when the signal generation component is a signal acquisition device and a signal generation circuit, the excitation signal is an oscillation signal picked up by the signal acquisition device and the signal generation circuit in cooperation on the capacitive touch screen.

[0010] Preferably, the excitation signal is a signal of a capacitive touch scanning capacitance channel collected by electric field induction at any one or more points within the effective touch area of the capacitive touch screen.

[0011] Preferably, the signal acquisition device is a conductive transparent material or an opaque conductive material.

[0012] Preferably, the analog touch command is a touch operation performed on a target touch point on the capacitive touch screen.

[0013] Preferably, the signal control component includes an electrode array of at least one electrode, and the electrode array covers the effective touch area of the capacitive touch screen.

[0014] Preferably, the electrode is a conductive transparent material or an opaque conductive material.

[0015] Preferably, the electrode array is a regular array or an irregular array.

[0016] Preferably, the electrode array is in direct contact with the capacitive touch screen, or there is a certain gap between the electrode array and the capacitive touch screen.

[0017] Preferably, the target touch point is located on a certain electrode, and the analog touch signal is sent to the electrode; or, the target touch point is located between two adjacent electrodes, and the analog touch signal is sent to the two electrodes.

[0018] Preferably, when the target touch point is located between two adjacent electrodes, the analog touch signal is sent to the two electrodes, specifically:

[0019] The target touch point is point P, the electrodes are points A, B, C, and D, and the coordinates of points A, B, C, D, and P are set as A(Xa, Yd), B(Xa, Yc), C(Xb, Yc), D(Xb, Yd), P(Xp, Yp). The calculation formula for the target touch point P(Xp, Yp) is as follows:

[0020] Xp = mXa + nXb

[0021] Yp = jYc + kYd

[0022] Wherein, m and n are the signal gain weights of the corresponding electrodes of points A, B, C, and D in the X-axis direction; j and k are the signal gain weights of the corresponding electrodes of points A, B, C, and D in the Y-axis direction.

[0023] Preferably, the signal processing component processes the amplitude and phase of the excitation signal and generates the control signal; the frequency of the analog touch signal is close to the oscillation frequency of the capacitive touch screen itself, and the phase of the analog touch signal is opposite to the phase of the capacitive touch screen itself.

[0024] Implementing the technical solution of the analog touch device based on electric field induction of the present invention has the following advantages or technical effects: The analog touch device based on electric field induction of the present invention establishes a voltage reference point by connecting both the analog touch device and the capacitive touch screen of the intelligent terminal to the common ground, and then transmits an excitation signal to the surface of the effective touch area of the capacitive touch screen to generate an electric field, thereby affecting the charging time of the receiving end of the capacitive touch screen to achieve an analog touch effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings. In the drawings:

[0026] Figure 1 is a schematic diagram of the analog touch device and the capacitive touch screen of the embodiment of the present invention connected to the common ground;

[0027] Figure 2 is a schematic diagram of the first module of the analog touch device of the embodiment of the present invention;

[0028] Figure 3 is a schematic diagram of the second module of the analog touch device of the embodiment of the present invention;

[0029] Figure 4 is a schematic diagram of the capacitive touch screen of the analog touch device of the embodiment of the present invention;

[0030] Figure 5 is a schematic diagram of the application of the analog touch device of the embodiment of the present invention;

[0031] Figure 6 is a schematic diagram of the target touch point of the analog touch device of the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] In order to make the objectives, technical solutions and advantages of the present invention clearer, the various embodiments to be described below will refer to the corresponding drawings, which form a part of the embodiments and describe various embodiments that may be adopted to implement the present invention. It should be understood that other embodiments may also be used, or structural and functional modifications may be made to the embodiments listed herein without departing from the scope and essence of the present invention. In other cases, detailed descriptions of well-known systems, devices, circuits and methods are omitted to avoid unnecessary details from interfering with the description of the present invention.

[0033] In order to illustrate the technical solutions described in the present invention, the following will be illustrated through specific embodiments.

[0034] The analog touch control device based on electric field induction of the present invention is mainly applied to some occasions that require multi-finger operations (such as touch and slide) in (mobile) intelligent terminal entertainment peripherals. Nowadays, life is inseparable from intelligent terminals, especially smartphones, tablets, etc. The greatest advantage of these intelligent terminals is portability. As the entertainment software adapted to intelligent terminals becomes more and more mature, the entertainment software that used to be only available on PCs or professional entertainment devices (such as large game consoles, etc.) is gradually transplanted to intelligent terminals, so that users can enjoy entertainment anytime and anywhere. However, for some entertainment software, such as the current popular game entertainment software, when playing on an intelligent terminal, users need to hold the intelligent terminal and perform corresponding touch operations at the same time, which has great limitations and affects the user experience. The present invention controls the electric field to simulate capacitive touch, adopts electric field control technology, and is applicable to mutual capacitance, self-capacitance, self-mutual integration, and matrix self-capacitance patterns; it needs to be connected to the common ground, set a reference point, and is relatively less affected by the induction distance. The analog touch control device based on electric field induction of the present invention can be applied to game controller products. Users can clamp the intelligent terminal with the game controller, simulate the touch peripheral through buttons and joysticks, operate the game, enhance the user experience, and have great commercial value.

[0035] Figure 1-6 The schematic diagram of the embodiment of the analog touch control device based on electric field induction of the present invention is shown. For the convenience of description, only the parts related to the embodiment of the present invention are shown. The analog touch control device based on electric field induction is applied to a capacitive touch screen. Both the analog touch control device and the capacitive touch screen are connected to the common ground. The analog touch control device includes a signal processing component, a signal generating component, and a signal control component that are all connected to the signal processing component. Specifically, the capacitive touch screen can be a touch screen with mutual capacitance, self-capacitance, self-mutual integration, or matrix self-capacitance pattern. Preferably, the signal processing component can be an STM32F103 series chip, or other series chips of this company. Of course, it can also be chips of other companies with similar functions. No specific limitation is made here.

[0036] In this embodiment, the signal generating component is used to generate an excitation signal, the signal processing component is used to process the excitation signal and generate a control signal; the signal control component is used to generate an analog touch signal according to the control signal and transmit it to the effective touch area of the capacitive touch screen; after receiving the analog touch instruction, the signal processing component enables and processes the excitation signal generated by the signal generating component and generates a control signal, and the signal control component transmits the analog touch signal to the effective touch area of the capacitive touch screen to simulate the touch operation on the target touch point of the capacitive touch screen.

[0037] In this embodiment, the signal generating component is used to generate an excitation signal, and there are two ways to generate this excitation signal: one is the excitation signal actively generated by the device, and the other is to receive the oscillation signal of the capacitive touch screen through the capacitive touch screen of the smart terminal as the excitation signal; the excitation signal is an external signal source for the capacitive touch screen to produce a touch effect. The signal generating component can be generated by a simple signal generating circuit, or the oscillation signal on the capacitive touch screen can be picked up through the cooperation of a structural device and a signal generating circuit. As Figure 2 shown, when the signal generating component is a signal generating circuit, the frequency and phase of the excitation signal are close to (or even the same as) the oscillation frequency and phase of the capacitive touch screen itself.

[0038] As Figure 3 shown, when the signal generating component is a signal acquisition device and a signal generating circuit, the excitation signal is the oscillation signal on the capacitive touch screen picked up through the cooperation of the signal acquisition device and the signal generating circuit. Specifically, the excitation signal is a control signal for capacitive touch scanning collected by means of electric field induction at any one or more points within the effective touch area of the capacitive touch screen. Preferably, the signal acquisition device can be a conductive transparent material or an opaque conductive material, that is, it can be a conductive transparent material or an opaque conductive material. Specifically, the signal processing component is used to process the excitation signal and generate a control signal. More specifically, the signal processing component processes the amplitude and phase of the excitation signal and generates a control signal, and this control signal: through the processing of the excitation signal, an electric signal for generating a touch effect on the capacitive touch screen is achieved. At the same time, the frequency of the analog touch signal is close to the oscillation frequency of the capacitive touch screen itself, and the phase of the analog touch signal is opposite to the phase of the capacitive touch screen itself.

[0039] In this embodiment, the analog touch instruction is a touch operation performed on a target touch point on the capacitive touch screen. Specifically, the analog touch instruction includes: key instructions, swipe instructions, etc. After receiving the analog touch instruction, the signal processing component enables and processes the excitation signal generated by the signal generating component and generates a control signal, controls the amplitude and phase of the excitation signal, and transmits the analog touch signal to the effective touch area of the capacitive touch screen through the signal control component to simulate the touch operation on the target touch point of the capacitive touch screen and implement the corresponding touch function.

[0040] As Figure 4-5As shown, the signal control component (where 1, 2, and 3 are effective touch areas, and 4 is the signal control component) is used to generate an analog touch signal according to a control signal and transmit it to the effective touch area of the capacitive touch screen; specifically, after receiving an analog touch instruction, the signal processing component enables and processes the excitation signal of the signal generation component and generates a control signal, and the signal control component transmits the analog touch signal to the effective touch area of the capacitive touch screen to simulate a touch operation on the target touch point of the capacitive touch screen.

[0041] In this embodiment, the signal control component includes an electrode array with at least one electrode, and the electrode array covers the effective touch area of the capacitive touch screen. Specifically, the signal control component can be an electrode existing in the effective touch area of the capacitive touch screen, or any combination of multiple electrodes. The electrode array can be a regular array or an irregular array, that is, it can be a regular rectangular array, circular array, triangular array, etc., or an irregular multi-electrode array; the electrode can be a conductive transparent material or an opaque conductive material. The electrode array can be in direct contact with the capacitive touch screen, or there is a certain gap between the electrode array and the capacitive touch screen, that is, the electrode array can either directly contact the surface of the capacitive touch screen or leave a certain small gap in the middle.

[0042] In this embodiment, if the target touch point is located on a certain electrode, the analog touch signal is sent to this electrode; if the target touch point is located between two adjacent electrodes, the analog touch signal is sent to these two electrodes, and different positions of the target touch point are achieved by controlling the signal gain sent to the two electrodes. More specifically, the electrodes in the signal control component can be regularly distributed, and by adjusting the controlled signal gain, the position of the target touch point can be changed.

[0043] As Figure 6 shown, to achieve the touch of the target touch point P, only the signals of the electrodes of the signal control components at points A, B, C, and D need to be adjusted. Similarly, if a continuous trajectory touch is to be achieved, only the signals of A, B, C, and D need to follow a continuous law of change. More specifically, assuming the coordinates of A, B, C, D, and P are A(Xa, Yd), B(Xa, Yc), C(Xb, Yc), D(Xb, Yd), and P(Xp, Yp) in sequence, the calculation formula for P(Xp, Yp) is as follows:

[0044] Xp = mXa + nXb

[0045] Yp = jYc + kYd

[0046] Among them, m and n are the signal gain weights of the corresponding electrodes of points A, B, C, and D in the X-axis direction; j and k are the signal gain weights of the corresponding electrodes of points A, B, C, and D in the Y-axis direction. Generally, there is a certain relationship among the weights for controlling the signal gain. For example, m + n = 1 and j + k = 1. Assume that when the position of Xp is exactly in the middle between Xa and Xb, then Xp = (Xa + Xb) / 2, and at this time m = n = 1 / 2; assume m = 1 / 4 and n = 3 / 4, then Xp = Xa / 4 + 3*Xb / 4, and at this time Xp is closer to Xb.

[0047] The key technical point of the analog touch control device based on electric field induction in the present invention lies in the capacitive touch control principle. Based on the premise that the electric field can affect the movement of electrons, it uses the electric field to change the capacitance change of the capacitive touch screen. Therefore, as long as the electric field strength is adjusted, the analog touch failure caused by the distance between the signal control component and the capacitive touch screen can be overcome. An electric field is a special substance existing in the space around charges and changing magnetic fields. This substance is different from ordinary physical objects. Although it is not composed of molecules and atoms, it is an objectively existing special substance and has attributes such as force and energy that ordinary substances have. The force property of the electric field is manifested as: the electric field has a force on the charges placed in it, and this force is called the electric field force. The energy property of the electric field is manifested as: when a charge moves in the electric field, the electric field force does work on the charge, indicating that the electric field has energy. Capacitance is also called "electrical capacitance", which refers to the charge storage capacity under a given potential difference, denoted as C, and the international unit is the farad (F). Generally speaking, charges will be forced to move in an electric field. When there is a medium between conductors, the movement of charges is hindered, causing charges to accumulate on the conductors, resulting in the cumulative storage of charges, and the stored charge quantity is called capacitance.

[0048] The principle of capacitive touch control is based on detecting the capacitance change amount of the touch point. The detection process of detecting the capacitance change amount is to calculate the cumulative amount of the capacitance charging charge per unit time. Only by external intervention to change the capacitance charging charge per unit time can the same effect of changing the capacitance change amount be achieved, and the purpose of realizing analog touch can be achieved. By sharing the ground between the analog touch control device and the capacitive touch screen of the intelligent terminal, a voltage reference point is established, and the excitation signal is transmitted to the surface of the effective touch area of the capacitive touch screen to generate an electric field, thereby affecting the charging time of the receiving end of the capacitive touch screen and achieving the analog touch effect. The present invention is applicable to almost all capacitive touch control methods on the current market, including but not limited to self-capacitance, mutual capacitance, self-mutual integration, etc., as well as touch screens with various capacitive touch control patterns, including but not limited to strip, diamond, triangle, matrix pattern, etc.

[0049] The above are only the preferred embodiments of the present invention. Those skilled in the art will know that without departing from the spirit and scope of the present invention, various changes or equivalent replacements can be made to these features and embodiments. Additionally, under the teaching of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the protection scope of the present invention.

Claims

1. An analog touch control device based on electric field induction, characterized in that, applied to a capacitive touch screen, both the analog touch control device and the capacitive touch screen are connected to a common ground, and the analog touch control device includes a signal processing component, a signal generating component and a signal control component both connected to the signal processing component; The signal generating component is used to generate an excitation signal; The signal processing component is used to process the excitation signal and generate a control signal; The signal control component is used to generate an analog touch signal according to the control signal and transmit it to the effective touch area of the capacitive touch screen; After receiving an analog touch instruction, the signal processing component enables and processes the excitation signal generated by the signal generating component and generates a control signal, and the signal control component transmits the analog touch signal to the effective touch area of the capacitive touch screen to simulate a touch operation on the target touch point of the capacitive touch screen; When the signal generating component is a signal generating circuit, the frequency and phase of the excitation signal are close to the oscillation frequency and phase of the capacitive touch screen itself; When the signal generating component is a signal acquisition device and a signal generating circuit, the excitation signal is an oscillation signal picked up by the signal acquisition device and the signal generating circuit in cooperation on the capacitive touch screen; The frequency of the analog touch signal is close to the oscillation frequency of the capacitive touch screen itself, and the phase of the analog touch signal is opposite to the phase of the capacitive touch screen itself; The signal control component includes an electrode array of at least one electrode, and the electrode array covers the effective touch area of the capacitive touch screen.

2. The analog touch control device based on electric field induction according to claim 1, characterized in that, The excitation signal is a signal of a capacitive touch scanning capacitance channel collected by any one or more points in the effective touch area of the capacitive touch screen by means of electric field induction.

3. The analog touch control device based on electric field induction according to claim 2, characterized in that, The signal acquisition device is a conductive transparent material or an opaque conductive material.

4. The analog touch control device based on electric field induction according to claim 1, characterized in that, The electrode is a conductive transparent material or an opaque conductive material.

5. The analog touch control device based on electric field induction according to claim 4, characterized in that, The electrode array is a regular array or an irregular array; The electrode array is in direct contact with the capacitive touch screen, or there is a certain gap between the electrode array and the capacitive touch screen.

6. The analog touch control device based on electric field induction according to claim 4, characterized in that, When the target touch point is located on a certain electrode, the analog touch signal is sent to the electrode; When the target touch point is located between two adjacent electrodes, the analog touch signal is sent to the two electrodes.

7. The analog touch control device based on electric field induction according to claim 6, characterized in that, When the target touch point is located between two adjacent electrodes, the analog touch signal is sent to the two electrodes, specifically: The target touch point is point P, and the electrodes are points A, B, C, and D. Set the coordinates of points A, B, C, D, and P as A(Xa, Yd), B(Xa, Yc), C(Xb, Yc), D(Xb, Yd), and P(Xp, Yp). The calculation formula for the target touch point P(Xp, Yp) is as follows: Xp = mXa + nXb Yp = jYc + kYd Where, m and n are the signal gain weights of the corresponding electrodes of points A, B, C, and D in the X-axis direction; j and k are the signal gain weights of the corresponding electrodes of points A, B, C, and D in the Y-axis direction.

8. The analog touch control device based on electric field induction according to claim 1, characterized in that the analog touch instruction is a touch operation performed on the target touch point on the capacitive touch screen; the signal processing component processes the amplitude and phase of the excitation signal and generates the control signal.

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